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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Aug. 06, 2021	Mar. 31, 2022	Mar. 31, 2021
Robert W. Baird Co. Inc [Member] | Sales Agreement [Member] | ATM Program [Member] | Maximum [Member]
Stockholders Equity Note [Line Items]
Maximum aggregate offering amount of stock	$ 300,000
Common Stock | Robert W. Baird Co. Inc [Member]
Stockholders Equity Note [Line Items]
Number of shares sold under atm		0
Common Stock | Stock Option
Stockholders Equity Note [Line Items]
Net proceeds from the sale of Common stock		$ 3,955	$ 3,469
Common Stock | Employee Stock Purchase Plan [Member]
Stockholders Equity Note [Line Items]
Net proceeds from shares purchased under ESPP		$ 465	$ 405
Common Stock | Class B Common Stock
Stockholders Equity Note [Line Items]
Cash dividends paid per share of Common and Class B common stock		$ 1.95	$ 1.775

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Aggregate dividends paid during the period for each share of common stock outstanding.

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